KR20220137714A - magnetic fixture - Google Patents

Abstract

It is possible to provide a versatile, thin magnetic fixture capable of easily and reliably fixing the magnet to the rotational center of the pointer while the center of the magnet coincides with the rotational center of the pointer.
(Solution) The magnet fixture is mounted on the center of rotation of the pointer of the analog meter, and is a magnet fixture for fixing a magnet for detecting the rotation angle, and is formed on the main body and the upper surface of the main body to set the magnet as the rotation center of the pointer. A magnet holding portion held on the top; a slit portion formed on a plane perpendicular to the rotation center in the main body portion to accommodate the rotation center of the pointer; and a rotating shaft holding part which is formed to protrude outward from the outer peripheral edge of the body part, and a pointer control part for regulating rotation of the pointer with respect to the body part.

Description

magnetic fixture

The present invention relates to a magnet fixture.

Patent Document 1 discloses a magnet fixture that is attached to the rotation center of a pointer of a pressure gauge and holds a magnet for detecting the rotation angle of the pointer.

Utility Model Registration No. 3161399

However, since the magnet fixture disclosed in Patent Document 1 has a cover on the upper side of the magnet, it is difficult to reduce the thickness of the magnet fixture, and it cannot be installed when the gap between the pointer of the pressure gauge and the transparent plate is narrow. In addition, the magnet fixture disclosed in Patent Document 1 cannot be universally installed with respect to the guides of various sizes because it is necessary to adapt the dimensions of each part to the guides having a specific size.

Further, in the technique disclosed in Patent Document 1, since it is necessary to form an exchange transparent plate having the same external shape as that of the transparent plate of the pressure gauge, costs such as parts cost and mold cost are additionally required for it. Moreover, since the technique disclosed by patent document 1 needs to prepare the transparent plate for exchange according to the outer diameter of a meter, it cannot respond easily to several types of meters from which an outer diameter differs. Besides, conventionally, a method of obtaining the center position of an analog meter and attaching a magnetic sensor to the position has been used. However, this method takes time.

A magnet fixture according to an embodiment is a magnet fixture mounted on a rotation center of a pointer of an analog meter for fixing a magnet for detecting a rotational angle, and is formed on a body portion and an upper surface of the main body portion, and causes the magnet to rotate the pointer. A magnet holding portion held on the center; a slit portion formed on a plane perpendicular to the rotation center in the main body portion to accommodate the rotation center of the pointer; A rotating shaft holding part for holding, and a pointer regulating part protruding outward from the outer peripheral edge of the body part and regulating rotation of the pointer with respect to the body part are provided.

In addition, a positioning device according to an embodiment is a positioning device for positioning a sensor unit with respect to the center of a surface of a substantially circular and transparent cover member covering a display surface of an analog meter, wherein each other in a first direction a pair of clamping members formed to face each other and clamping the outer circumferential surface of the outer frame of the cover member; A rack to connect with, on the back side of the cover member, a center block formed to be positioned at an intermediate position between the pair of clamping members irrespective of the distance between the pair of clamping members, and on the front side of the cover member, 1 A positioning member that is formed to be positioned at an intermediate position between the pair of clamping members, regardless of the distance between the pair of clamping members, holds the sensor unit, and positions the sensor unit with respect to the center of the surface of the cover member; do.

According to one embodiment, it is possible to provide a versatile and thin magnetic fixture capable of easily and reliably fixing the magnet to the rotational center of the pointer while the center of the magnet coincides with the rotational center of the pointer. .

Moreover, according to the positioning device which concerns on one Embodiment, with respect to several types of meters from which an outer diameter differs, a magnetic sensor can be positioned easily in the center of a meter.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external perspective view of the magnet fixture which concerns on 1st Embodiment.
Fig. 2 is a plan view of the magnet fixture according to the first embodiment.
Fig. 3 is a side view of the magnet fixture according to the first embodiment.
Fig. 4 is a front view of the magnet fixture according to the first embodiment.
Fig. 5 is a bottom view of the magnet fixture according to the first embodiment.
Fig. 6 is a perspective cross-sectional view showing a cross section taken along the line AA of the magnet fixture according to the first embodiment.
7 is an exploded perspective view of the structure according to the first embodiment.
Fig. 8 is a view for explaining a method of attaching the magnet fixture according to the first embodiment.
Fig. 9 is a view for explaining a method for attaching the magnet fixture according to the first embodiment.
Fig. 10 is a diagram for explaining a method for attaching a magnet according to the first embodiment.
11 is a diagram for explaining a method for attaching a magnet according to the first embodiment.
12 is a cross-sectional view taken along line AA of the structure shown in FIG. 11 .
Fig. 13 is a view for explaining the insertion operation of the long needle part of the guide for the magnet fixture according to the first embodiment.
Fig. 14 is a diagram for explaining the insertion operation of the long needle part of the guide for the magnet fixture according to the first embodiment.
15 is a diagram showing a configuration example of the rotation angle detection system according to the first embodiment.
Fig. 16 is an external perspective view of the positioning device according to the second embodiment as seen from above.
Fig. 17 is an external perspective view of the positioning device according to the second embodiment as seen from below.
Fig. 18 is a plan view showing an example of installation of the sensor unit according to the second embodiment to an analog meter.
Fig. 19 is a side view showing an example of installation of the sensor unit according to the second embodiment to an analog meter.
Fig. 20 is a diagram showing an expanded example of the positioning device according to the second embodiment.

[First Embodiment]

EMBODIMENT OF THE INVENTION Hereinafter, 1st Embodiment is described with reference to drawings.

(Configuration of the magnetic fixture 100)

1 is an external perspective view of a magnet fixture 100 according to a first embodiment. Fig. 2 is a plan view of the magnet fixture 100 according to the first embodiment. 3 is a side view of the magnet fixture 100 according to the first embodiment. 4 is a front view of the magnet fixture 100 according to the first embodiment. 5 is a bottom view of the magnet fixture 100 according to the first embodiment. 6 is a perspective cross-sectional view showing a cross section taken along the line A-A (refer to FIG. 3 ) of the magnet fixture 100 according to the first embodiment.

The magnet fixture 100 shown in FIGS. 1-6 is a member which is comparatively thin and has the body part 100A of substantially disk shape. The magnet fixture 100 has a disk shape for detecting a rotational angle with respect to the rotational center 30A (the portion in which the rotational shaft portion 32 is formed) of the pointer 30 (refer to FIGS. 7 to 9) of the analog meter. In order to fix the magnet 20 (see Figs. 7 to 9), it is mounted on the rotating center portion 30A of the pointer 30. As shown in Figs. The magnet fixture 100 is formed, for example, by injection molding a resin material having elasticity such as PP (polypropylene) resin. In the following description, for convenience, the directions along the rotational center AX2 of the rotation shaft 32 are the vertical direction and the Z-axis direction, and the longitudinal direction of the long needle 36 of the pointer 30 is the front-back direction and Let it be an X-axis direction, and let the width direction of the long needle part 36 of the pointer|point 30 be a left-right direction and a Y-axis direction.

1 to 6 , the main body portion 100A of the magnet fixture 100 has a constant height and width at the center portion in the vertical direction (Z-axis direction), and is parallel to the XY plane. A slit portion 102 is formed. The slit portion 102 is a portion in which a part centering on the rotation center AX2 of the pointer 30 is accommodated. The slit part 102 has the opening part 102A at the edge part of the Y-axis positive side. Thereby, the slit part 102 can slide and insert the rotation center part 30A of the pointer|tip 30 from the opening part 102A. The upper surface 102B and the lower surface 102C of the opening portion 102A have a tapered shape that is inclined so that the height and width of the opening portion 102A gradually increases toward the outside (positive side of the Y-axis). Thereby, in the slit portion 102, the rotation center 30A of the pointer 30 can be easily inserted from the opening 102A. The main body part 100A of the magnet fixture 100 has the upper wall part 110 which becomes the upper side (Z-axis positive side) of the slit part 102 by the slit part 102 being formed, and the slit part 102. It is supposed to have the lower wall part 120 used as the lower side (Z-axis negative side). The upper wall portion 110 and the lower wall portion 120 are both parallel to the XY plane and have a thin flat plate shape.

The upper wall portion 110 has a constant width in the front-rear direction (X-axis direction) from the left (Y-axis positive side) end to the center AX1 at the central portion in the front-rear direction (X-axis direction), and left and right A notched upper slide groove 111 extending in the direction (Y-axis direction) is formed. The upper slide groove 111 is a circumferential portion 34 formed to protrude upward from the rotation center 30A of the pointer 30 when the needle 30 is slid through the slit 102 (FIG. 7). and FIG. 8 ) are formed so as not to interfere with the upper wall portion 110 . For this reason, the width in the front-back direction (X-axis direction) of the upper slide groove 111 is larger than the diameter of the circumferential part 34. As shown in FIG.

In addition, an annular magnet holding portion 112 having a constant height is formed on the upper surface of the upper wall portion 110 . The magnet holding part 112 is a part which holds the disk-shaped magnet 20 in the inside. The height of the magnet holding part 112 from the upper surface of the upper wall part 110 is substantially the same size as the thickness of the magnet 20 , and the inner diameter of the magnet holding part 112 is approximately the same size as the outer diameter of the magnet 20 . to be. Thereby, the magnet holding part 112 has a required minimum size, and it is supposed to contribute to downsizing of the body part 100A. The inner peripheral edge 112A (that is, the upper opening) in the upper end of the magnet holding portion 112 has an inner diameter slightly smaller than the maximum outer diameter of the magnet 20 . For this reason, the magnet holding part 112 can insert the magnet 20 from upper direction, and press the inner peripheral edge part 112A and spread the magnet 20, and it can pinch it. And the magnet holding part 112 can hold the magnet 20 so that the magnet 20 may not fall off easily by the inner peripheral edge part 112A.

In the lower wall part 120, a guide part is notched extending in the left-right direction (Y-axis direction) from the left (Y-axis positive side) end to the center AX1 at the central part in the front-back direction (X-axis direction). (121) is formed. The guide part 121 prevents the rotation shaft part 32 (refer FIG. 7) of the pointer 30 (refer FIG. 7) from interfering with the lower wall part 120 when the guide|guide_tool 30 slides in the slit part 102. , is formed in order to guide the rotating shaft part 32 to the rotating shaft holding part 122 . For this reason, the width|variety of the front-back direction (X-axis direction) of the guide part 121 is larger than the diameter of the rotating shaft part 32 except the rotating shaft holding part 122 and the rotating shaft regulating part 124 .

In the center AX1 of the guide portion 121, a rotation shaft holding portion 122 for holding the rotation shaft portion 32 protruding downward from the rotation center portion 30A of the pointer 30 is provided. is formed The rotating shaft holding part 122 has a circular shape in planar view from above. The inner diameter of the rotating shaft holding part 122 is smaller than the diameter of the rotating shaft part 32 .

In the inlet of the rotating shaft holding part 122 in the guide part 121, the rotating shaft regulating part 124 which restrict|regulates the detachment of the rotating shaft part 32 from the rotating shaft holding part 122 is formed. The width of the rotating shaft regulating part 124 is smaller than the diameter of the rotating shaft part 32 and smaller than the diameter of the rotating shaft holding part 122 .

Here, the guide part 121 includes a first elastic beam part 123A formed on the front side (X-axis positive side) of the guide part 121 , and a second elastic beam part 123A formed on the rear side (X-axis negative side) of the guide part 121 . It is a space sandwiched by the elastic beam part 123B. That is, the wall surface of the front side (X-axis positive side) of the guide part 121 is formed in the 1st elastic beam part 123A, The wall surface of the rear side (X-axis negative side) of the guide part 121 is a 2nd elastic beam part. (123B) is formed.

The first elastic beam portion 123A and the second elastic beam portion 123B are elastically deformable in the front-rear direction (X-axis direction), and both ends in the left-right direction (Y-axis direction) are formed by the lower wall portion 120 . is supported

As a result, in the magnet fixture 100 according to the first embodiment, when the rotary shaft portion 32 is slid toward the rotary shaft holding portion 122 in the guide portion 121, the rotary shaft regulating portion 124 is moved to the rotary shaft portion ( 32), the rotating shaft part 32 can be inserted into the rotating shaft holding part 122, pressing and spreading.

At this time, the magnet fixture 100 which concerns on 1st Embodiment can press the rotating shaft holding part 122 by the rotating shaft part 32, and spread it, and can adjust the size according to the diameter of the rotating shaft part 32. As shown in FIG. Thereby, the magnet fixture 100 which concerns on 1st Embodiment does not generate|occur|produce backlash between the rotating shaft holding part 122 and the rotating shaft part 32, and the rotating shaft part 32 is reliably secured by the rotating shaft holding part 122. can keep it

Moreover, since the diameter centering on the center AX1 is variable by the 1st elastic beam part 123A and the 2nd elastic beam part 123B being elastically deformed, the rotation shaft holding part 122 is the rotation shaft part 32. Corresponding to various thicknesses, the rotating shaft part 32 can be clamped.

Further, in the magnet fixture 100 according to the first embodiment, the rotating shaft part 32 held by the rotating shaft holding part 122 by the rotating shaft regulating part 124 formed at the inlet of the rotating shaft holding part 122, It can be made not to come off easily from the rotating shaft holding part 122.

In addition, both the center of the rotating shaft holding part 122 and the center of the magnet holding part 112 coincide with the center AX1 of the magnet fixing tool 100 . Moreover, the center of the rotating shaft holding part 122 coincides with the rotation center AX2 of the rotating shaft part 32 irrespective of the diameter of the rotating shaft part 32. As shown in FIG. For this reason, the magnet fixture 100 which concerns on 1st Embodiment sets the rotation center AX2 of the rotation shaft part 32 irrespective of the diameter of the rotation shaft part 32, and the center AX1 of the magnet fixture 100. can coincide with , that is, coincide with the center of the magnet 20 . Therefore, the magnet fixture 100 which concerns on 1st Embodiment can suppress the rotational bias of the magnet 20 accompanying rotation of the rotating shaft part 32. As shown in FIG.

Further, the magnet fixture 100 is formed to protrude outward (X-axis positive direction) from the outer periphery of the body portion 100A (upper wall portion 110), and the body portion 100A (upper wall portion 110). and a guide regulating unit 130 for regulating the rotation of the guide 30 with respect to .

Specifically, the pointer regulating section 130 extends from the outer peripheral edge of the front side (X-axis positive side) of the upper wall portion 110 to the front (X-axis positive direction) that is the longitudinal direction of the long needle portion 36 of the pointer 30 . It has a protrusion part 131 formed to protrude, and a tongue piece part 132 formed extending from the upper surface of the protrusion part 131 in a rightward (Y-axis negative direction) that is the width direction of the long needle part 36 of the pointer. The tongue piece part 132 is elastically deformable in a direction parallel to the rotation center AX2 (Z-axis direction), and the long needle part 36 of the needle 30 arranged below the tongue piece part 132 is upwardly moved. can be pressed from

Moreover, the tongue piece part 132 is formed to be inclined from the protrusion part 131 so that the clearance gap 130A between the protrusion part 131 may spread gradually downward (Z-axis negative direction). Thereby, the pointer|tip regulating part 130 has both ends in the width direction of the long needle part 36 of the pointer|guide_body 30 arrange|positioned in the clearance gap 130A exposed to the clearance gap 130A of the protrusion part 131. It can hold|maintain by the 1st contact surface 131A and the 2nd contact surface 132A exposed to the clearance gap 130A of the tongue piece part 132.

(Configuration of structure 10)

7 is an exploded perspective view of the structure 10 according to the first embodiment. As shown in FIG. 7 , the structure 10 according to the first embodiment includes a magnet fixture 100 , a magnet 20 , and a pointer 30 . The magnet fixture 100 is attached to the slit portion 102 such that the center AX1 of the magnet fixture 100 and the center of rotation AX2 of the rotation shaft 32 of the pointer 30 coincide with each other. By being inserted, it is attached to the guide 30 .

The magnet 20 is mounted on the magnet holding portion 112 of the magnet fixture 100 to detect the rotation angle of the pointer 30 . The magnet 20 is attached to the magnet holding part 112 so that the center 20A of the magnet 20 is the center AX1 of the magnet fixture 100 and the magnet 20 for detecting the rotation angle. ) coincides with the center of The magnet 20 has a thin disk shape. The magnet 20 is magnetized to an N pole and an S pole with the boundary line 20B passing through the center 20A of the magnet 20 as a boundary in planar view.

(Method of assembling the structure 10)

Next, with reference to FIGS. 8-12, the assembly method of the structure 10 which concerns on 1st Embodiment is demonstrated. 8 and 9 are diagrams for explaining a method of attaching the magnet fixture 100 according to the first embodiment. 10 and 11 are diagrams for explaining a method of attaching the magnet 20 according to the first embodiment. 12 is a cross-sectional view taken along the line A-A of the structure 10 shown in FIG. 11 .

First, as shown in Fig. 8, the rotation center 30A of the pointer 30 is inserted into the slit portion 102 from the opening 102A formed on the Y-axis positive side of the magnet fixture 100, and the slit portion ( 102) Slide the inside in the negative Y-axis direction. At this time, the rotating shaft portion 32 of the guide 30 is slid in the negative Y-axis direction in the guide portion 121 between the first elastic beam portion 123A and the second elastic beam portion 123B. Moreover, at this time, the circumferential part 34 of the pointer|guide_body 30 is slid in the Y-axis negative direction in the upper slide groove 111 formed in the upper wall part 110. As shown in FIG.

And when the rotating shaft part 32 of the guide part 30 collides with the rotation shaft regulating part 124 which is narrower in width than the rotation shaft part 32 in the guide part 121, the rotation center part 30A of the pointer|tip 30 , is again inserted in the negative Y-axis direction. Thereby, the rotating shaft part 32 of the pointer|tip 30 can be fitted into the rotating shaft holding part 122, pressing and widening the rotating shaft regulating part 124 by the rotating shaft part 32 of the pointer|tip 30.

As a result, as shown in FIG. 9 , the magnet fixture 100 is configured such that the center AX1 of the magnet fixture 100 coincides with the center of rotation AX2 of the rotation shaft 32 of the pointer 30, It is mounted on the guide (30).

Moreover, by performing the operation|movement of inserting the rotation shaft part 32 into the rotation shaft holding part 122, the insertion operation|movement of the guideline 30 mentioned later is performed simultaneously. As a result, as shown in FIG. 9 , the long needle portion 36 of the pointer 30 protrudes forward (positive X-axis direction) from the main body portion 100A of the magnet fixture 100. It is fitted into the gap 130A. Thereby, the rotation of the pointer|guide_body 30 with respect to the main-body part 100A of the magnet fixture 100 is regulated.

Moreover, as shown in FIG.10 and FIG.11, the magnet 20 for rotation angle detection is pinched|interposed in the magnet holding part 112 of the magnet fixture 100. As shown in FIG. Thereby, as shown in FIG. 11, the magnet fixture 100 detects the center AX1 of the said magnet fixture 100, the center of rotation AX2 of the rotation shaft part 32 of the pointer 30, and a rotation angle. The magnet 20 is mounted on the magnet holding part 112 so that the center of the dragon's magnet 20 coincides.

Further, after the operation of inserting the rotation shaft portion 32 of the pointer 30 into the rotation shaft holder portion 122 , the magnet 20 for detecting the rotation angle is inserted into the magnet holder portion 112 of the magnet fixture 100 . has been described in this order, before the operation of inserting the rotating shaft portion 32 of the pointer 30 into the rotating shaft holding portion 122, the magnet 20 for detecting the rotational angle in the magnet holding portion 112 of the magnet fixture 100 ) may be inserted.

Here, as shown in FIG. 12 , the height of the magnet holding part 112 is substantially the same size as the thickness of the magnet 20 , and the inner diameter of the magnet holding part 112 is substantially the same size as the outer diameter of the magnet 20 . to be. Thereby, the magnet holding part 112 has a required minimum size, and it is supposed to contribute to downsizing of the body part 100A.

Moreover, as shown in FIG. 12, the inner peripheral edge part 112A (namely, upper opening) in the upper end of the magnet holding part 112 has an inner diameter slightly smaller than the largest outer diameter of the magnet 20. As shown in FIG. For this reason, the magnet holding|maintenance part 112 inserts the magnet 20 from upper direction, and it is possible to insert the magnet 20, pressing and spreading the inner peripheral edge part 112A. And the magnet holding part 112 can hold|maintain the magnet 20 so that the magnet 20 may not fall off easily by the inner peripheral edge part 112A. In particular, since the inner peripheral edge portion 112A has a shape in which the outer peripheral edge portion of the magnet 20 holds the curved upper edge portion, the magnet holding portion 112 does not require a cover for covering the magnet 20 . , thus having a height equal to the thickness of the magnet 20 . In this way, the magnet fixture 100 according to the first embodiment is thinner and smaller in size. For example, in this embodiment, the thickness of the magnet 20 is 1 mm, and the diameter of the magnet 20 is 20 mm. On the other hand, the thickness of the magnet fixture 100 is about 3 mm, and the length of one side of the magnet fixture 100 is about 23 mm.

Moreover, the magnet fixture 100 which concerns on 1st Embodiment can mount the various magnets 20 from which diameter and thickness differ by changing the shape of the magnet holding part 112. As shown in FIG.

(inserting action of the long needle part 36 of the pointer 30)

13 and 14 are diagrams for explaining the insertion operation of the long needle part 36 of the pointer 30 into the magnet fixture 100 according to the first embodiment.

As shown in FIG. 13 , the rotational center portion 30A of the pointer 30 is slid in the Y-axis negative direction within the slit portion 102, and the rotational shaft portion 32 of the pointer 30 is moved to the rotation shaft holding portion 122. When the insertion operation is performed, the long needle portion 36 of the pointer 30 protrudes forward from the body portion 100A of the magnet fixture 100 (positive X-axis direction). Abuts against the inclined bottom surface 131B of the protrusion 131 .

Here, again, when the rotation center 30A of the pointer 30 is slid in the Y-axis negative direction in the slit portion 102, the long needle portion 36 of the pointer 30 moves downward along the bottom surface 131B. while elastically deforming, it moves in the negative Y-axis direction.

Then, when the long hand portion 36 of the guideline 30 exceeds the bottom surface 131B, as shown in FIG. 14 , the long hand portion 36 of the guideline 30 becomes the tongue piece portion ( 132) is pushed upward, and it is arrange|positioned in the clearance gap 130A between the tongue piece part 132 and the protrusion part 131.

As a result, as shown in FIG. 14 , as for the long needle part 36 of the pointer 30 , both ends in the width direction (Y-axis direction) are exposed to the gap 130A of the protrusion part 131 . It is held by the abutment surface 131A and the second abutment surface 132A exposed to the gap 130A of the tongue piece portion 132 .

In addition, since the width and height positions of the gap 130A are variable as the tongue piece part 132 is elastically deformed, the guide control part 130 corresponds to the various widths and thicknesses of the long needle part 36, so that the long needle part 130 is a long needle part. The both ends in the width direction of (36) can be hold|maintained.

(Configuration example of rotation angle detection system 200)

15 : is a figure which shows the structural example of the rotation angle detection system 200 which concerns on 1st Embodiment. As shown in FIG. 15 , the rotation angle detection system 200 includes an analog meter 210 , a rotation angle detection device 220 , and a rotation angle transmitter 230 .

The analog meter 210 includes a pointer 30 and a glass cover 211 . The analog meter 210 is attached to the pointer 30 with the magnet fixture 100 described in the embodiment. The analog meter 210 is, for example, a water meter, a power meter, a gas meter, or the like.

The rotation angle detection device 220 is mounted on the center of the surface of the glass lid 211 (that is, the rotation center AX2 of the pointer 30). The rotation angle detection device 220 magnetically detects the rotation angle of the pointer 30 by a rotation angle detection sensor (not shown) formed to face the magnet 20 mounted on the magnet fixture 100 . Then, the rotation angle detection device 220 transmits a rotation angle detection signal indicating the detected rotation angle via a cable or wireless communication (for example, Bluetooth (registered trademark) wireless communication) to the rotation angle transmitter 230 send to For example, the rotation angle detection device 220 continuously detects the rotation angle of the pointer 30 at predetermined time intervals (eg, n second intervals), and transmits the rotation angle detection signal at predetermined time intervals ( For example, it transmits to the rotation angle transmitter 230 continuously at n second intervals).

The rotation angle transmitter 230 receives the rotation angle detection signal transmitted from the rotation angle detection device 220, and performs predetermined processing using the rotation angle of the pointer 30 indicated by the rotation angle detection signal (for example, , monitor display, abnormality detection, recording, data transmission to other devices, etc.). For example, the rotation angle transmitter 230 transmits a rotation angle detection signal indicating the detected rotation angle via wireless communication (eg, Bluetooth (registered trademark) wireless communication, Sigfox (registered trademark) wireless communication) , to the gateway or cloud.

Moreover, the rotation angle detection apparatus 220 may supply electric power via a cable from the battery with which the rotation angle transmitter 230 is equipped, for example. In this case, the configuration accompanying the rotation angle detection sensor of the rotation angle detection device 220 can be completed in the minimum necessary amount, and the rotation angle detection device 220 can be configured in a smaller size.

As described above, the magnet fixture 100 according to the first embodiment is attached to the rotation center 30A of the pointer 30 of the analog meter for fixing the disk-shaped magnet 20 for detecting the rotation angle. As the magnet fixture 100 , it is formed on the upper surface of the main body 100A and the main body 100A so that the magnet 20 is orthogonal to the rotational center AX2 and also the rotational center AX2 of the pointer 30 . A magnet holding portion 112 held on the top, and a slit portion 102 formed on a plane orthogonal to the rotational center AX2 in the body portion 100A and in which the rotational center 30A of the pointer 30 is accommodated. and a rotation shaft holding portion 122 formed below the slit portion 102 in the main body portion 100A to hold the rotation shaft portion 32 of the pointer 30, and an outer peripheral edge portion of the main body portion 100A. It is formed to protrude outward from the main body portion (100A) is provided with a guide control section (130) for regulating the rotation of the guide (30).

As a result, the magnet fixture 100 according to the first embodiment is attached to the rotation center 30A of the pointer 30 with respect to the various pointers 30 having different diameters and the like of the rotation shaft portion 32, and the magnet With the center of the pointer 20 aligned with the rotation center AX2 of the pointer 30 , the magnet 20 can be fixed to the rotation center 30A of the pointer 30 . Further, in the magnet fixture 100 according to the first embodiment, since the magnet 20 is held on the upper surface of the main body portion 100A, a cover for covering the upper surface of the magnet 20 is unnecessary, and the main body portion 100A. can be thinned. Accordingly, according to the magnet fixture 100 according to the first embodiment, the magnet 20 can be easily and reliably aligned with the rotation center AX2 of the pointer 30 with the center of the magnet 20 aligned. It is possible to provide a thin magnetic fixture 100 having versatility that can be fixed to the rotation center 30A of the pointer 30 .

Further, in the magnet fixture 100 according to the first embodiment, the main body portion 100A includes a first elastic beam portion 123A and a second elastic beam portion disposed opposite to each other below the slit portion 102 ( 123B), the rotating shaft holding part 122 is formed between the 1st elastic beam part 123A and the 2nd elastic beam part 123B, The 1st elastic beam part 123A and the 2nd elastic beam part 123B The rotation shaft part 32 is hold|maintained by clamping the rotation shaft part 32 by this.

Accordingly, in the magnet fixture 100 according to the first embodiment, the center of the magnet 20 is only held by the rotating shaft holding part 122 , irrespective of the diameter of the rotating shaft part 32 . can coincide with the center of rotation AX2 of the pointer 30 .

Moreover, in the magnet fixture 100 which concerns on 1st Embodiment, the main body part 100A is between the 1st elastic beam part 123A and the 2nd elastic beam part 123B, The outer peripheral edge of the main body part 100A. It has a guide part 121 which extends so as to gradually narrow in width toward the rotation shaft holder 122 from the shaft and guides the rotation shaft part 32 to the rotation shaft holder 122 .

Thereby, in the magnet fixture 100 which concerns on 1st Embodiment, attachment of the rotating shaft part 32 with respect to the rotating shaft holding part 122 can be performed easily and reliably.

Further, in the magnet fixture 100 according to the first embodiment, the pointer regulating portion 130 includes a protrusion 131 formed to protrude from the outer peripheral edge of the body portion 100A in the longitudinal direction of the pointer 30 and , formed to extend from the protrusion 131 in the width direction of the guide 30 , elastically deformable in a direction parallel to the rotation center AX2 , and has a tongue piece 132 for pressing the guide 30 .

Accordingly, in the magnet fixture 100 according to the first embodiment, the tongue piece 132 is elastically deformed, so that the height position of the tongue piece 132 pressing the pointer 30 is adjusted according to various thicknesses of the pointer 30 . can be adjusted.

Further, in the magnet fixture 100 according to the first embodiment, the tongue portion 132 is formed such that the gap 130A between the protrusion portion 131 and the protrusion portion 131 gradually widens toward the direction parallel to the rotation center AX2, It is formed obliquely from the protrusion 131, and the guideline regulating part 130 has both ends in the width direction of the guideline 30 arranged in the gap 130A of the protrusion 131 exposed to the gap 130A. It is held by the first abutting surface 131A and the second abutting surface 132A of the tongue piece portion 132 exposed to the gap 130A.

As a result, in the magnet fixture 100 according to the first embodiment, the tongue portion 132 is elastically deformed, so that the width of the gap 130A is adjusted according to the various widths of the pointer 30, so that the Both ends can be maintained.

Further, in the magnet fixture 100 according to the first embodiment, the slit portion 102 has an opening portion 102A at the outer peripheral edge portion of the main body portion 100A, and a pointer ( 30A of rotational center part 30A of 30 is slid in the direction orthogonal to rotational center AX2, and 30A of rotational center part of the pointer|guide_body 30 can be accommodated in the said slit part 102. As shown in FIG.

Thereby, the magnet fixture 100 which concerns on 1st Embodiment can accommodate the rotation center 30A of the pointer|guide_body 30 easily and reliably in the slit part 102. As shown in FIG.

Moreover, the magnet fixture 100 which concerns on 1st Embodiment is integrally formed using the resin material which has elasticity.

In this way, in the magnet fixture 100 according to the first embodiment, the portion to be elastically deformed can be easily and reliably formed integrally.

Further, the magnet fixture 100 according to the first embodiment is formed by injection molding a resin material.

Thereby, the magnet fixture 100 which concerns on 1st Embodiment can be formed more highly precisely.

[Second Embodiment]

EMBODIMENT OF THE INVENTION Hereinafter, 2nd Embodiment is described with reference to drawings.

(Configuration of positioning device 100)

Fig. 16 is an external perspective view of the positioning device 100 according to the second embodiment seen from above. Fig. 17 is an external perspective view of the positioning device 100 according to the second embodiment seen from below. In addition, in the following description, let the direction orthogonal to the surface 210A of the cover glass 210 of the analog meter 200 be an up-down direction (Z-axis direction) for convenience. Moreover, let the surface 210A side of the cover glass 210 be upper side (Z-axis positive side), and let the back surface side of the cover glass 210 be lower side (Z-axis negative side).

The positioning device 100 shown in Fig. 16 has a substantially circular and transparent cover glass 210 (an example of a "cover member") that covers the display surface of the analog meter 200 with respect to the center of the surface 210A, It is a device for positioning the sensor unit 300 .

As shown in FIG. 16 , the positioning device 100 includes a pair of clamping members 111 and 112 , two racks 121 and 122 , a pinion gear 123 , and a center block 130 , , a positioning plate 140 , and two pins 151 and 152 . In addition, a comparatively hard raw material (for example, a resin raw material, a metal raw material) is used and is formed for all the component parts with which the positioning device 100 is equipped.

The pair of clamping members 111 and 112 are formed to face each other in the X-axis direction (an example of the “first direction”). A pair of clamping members 111 and 112 clamps the outer peripheral surface 212A of the outer frame 212 of the cover glass 210 with which the analog meter 200 is equipped. A pair of clamping members 111, 112 is a so-called V-shaped block, and has support surface 111A, 112A which makes a V-shape in planar view from above. Support surfaces 111A and 112A are opposed to each other. 16 and 17 , as for the pair of clamping members 111 and 112 , each of the supporting surfaces 111A and 112A press-contacts the outer circumferential surface 212A of the outer frame 212, so that the outer circumferential surface 212A ) is pinched.

Moreover, the clamping member 111 has the mutually parallel 1st through-hole 111B and the 2nd through-hole 111C which penetrate the said clamping member 111 in the X-axis direction. The 1st through-hole 111B is formed in the Y-axis positive side of the clamping member 111, The edge part of the X-axis positive side of the rack 121 is inserted. As for the clamping member 111, when two screws 113 formed in the vicinity of the first through-hole 111B are twisted and tightened, the inner diameter of the first through-hole 111B is narrowed, and the X of the rack 121 is The end on the right side of the shaft is fixed. The 2nd through-hole 111C is formed in the Y-axis negative side of the clamping member 111, The edge part of the X-axis positive side of the rack 122 is slidably inserted.

Moreover, the clamping member 112 has the mutually parallel 1st through-hole 112B and the 2nd through-hole 112C penetrating the said clamping member 112 in the X-axis direction. The 1st through-hole 112B is formed in the Y-axis negative side of the clamping member 112, The edge part of the X-axis negative side of the rack 122 is inserted. As for the clamping member 112, when two screws 113 formed in the vicinity of the first through-hole 112B are twisted and tightened, the inner diameter of the first through-hole 112B is narrowed, and the X of the rack 122 is The end of the shaft negative side is fixed. The 2nd through-hole 112C is formed in the Y-axis positive side of the clamping member 112, The edge part of the X-axis negative side of the rack 121 is slidably inserted.

The two racks 121 and 122 are formed to extend in the X-axis direction in parallel to each other. The two racks 121 and 122 connect the pair of clamping members 111 and 112 so that the distance between the pair of clamping members 111 and 112 can be adjusted. Both of the two racks 121 and 122 are rod-shaped members extending linearly in the X-axis direction. Each of the two racks 121 and 122 has a plurality of rack gears 121A, 122A continuously formed in the X-axis direction at a portion inside the two racks 121 and 122 .

The rack 121 is formed in the Y-axis right side. The end of the rack 121 on the positive side of the X-axis is fixed to the clamping member 111 in a state in which the first through-hole 111B of the clamping member 111 is inserted. The end of the rack 121 on the negative side of the X-axis is slidably inserted through the second through-hole 112C of the clamping member 112 .

The rack 122 is formed on the Y-axis negative side. The end of the rack 122 on the negative side of the X-axis is fixed to the clamping member 112 in a state in which the first through hole 112B of the clamping member 112 is inserted. The end of the rack 122 on the right side of the X-axis is slidably inserted through the second through-hole 111C of the clamping member 111 .

The pinion gear 123 is formed in the circular accommodation space 131 formed on the back surface side of the center block 130, and between the two racks 121 and 122. As shown in FIG. The pinion gear 123 is rotatable in the accommodation space 131 of the center block 130 . The pinion gear 123 meshes with each of the rack gear 121A of the rack 121 and the rack gear 122A of the rack 122 . As a result, the pinion gear 123 can move the two racks 121 and 122 in mutually different directions in the X-axis direction with the rotation by the same amount.

Specifically, when the pinion gear 123 rotates clockwise (arrow D1) as seen from the bottom side as shown in FIG. 17 , the rack 121 is moved in the negative X-axis direction, and the rack ( 122) can be moved by the same amount as the rack 121 in the positive X-axis direction. In this case, the clamping member 111 fixed to the rack 121 and the clamping member 112 fixed to the rack 122 move mutually by the same amount in the mutually approaching direction. Accordingly, the center block 130 maintains the state in the intermediate position between the pair of clamping members 111 and 112 .

Conversely, when the pinion gear 123 rotates in the counterclockwise direction (arrow D2) as seen from the bottom surface side as shown in FIG. 17 , the rack 121 is moved in the X-axis positive direction, and the rack 122 is It is possible to move the same amount as the rack 121 in the negative X-axis direction. In this case, the clamping member 111 fixed to the rack 121 and the clamping member 112 fixed to the rack 122 move mutually in the direction away from each other by the same amount. Accordingly, the center block 130 maintains the state in the intermediate position between the pair of clamping members 111 and 112 .

The center block 130 is a block-shaped member extending in the Y-axis direction. The center block 130 is orthogonal to each of the two racks 121 and 122, and also extends to the outer side from each of the two racks 121 and 122. The center of the center block 130 overlaps with the center of the positioning device 100 . The center of the center block 130 is always in the state superimposed with the center of the positioning device 100 irrespective of the fluctuation|variation of the separation distance of a pair of clamping member 111, 112. In addition, the "center of the positioning device 100" is an intermediate position between the pair of clamping members 111 and 112 in the X-axis direction, and in the Y-axis direction, the two racks 121 and 122 is the intermediate position of

As shown in FIG. 17 , the center block 130 has a circular accommodating space 131 in the center of the back surface side. The accommodation space 131 accommodates the pinion gear 123 rotatably with the center of the positioning device 100 as a rotation center.

Moreover, the center block 130 has mutually parallel 1st through-hole 132A and the 2nd through-hole 132B which penetrate the said center block 130 in the X-axis direction. The 1st through-hole 132A is formed in the Y-axis positive side of the center block 130, and the rack 121 is slidably inserted. The first through hole 132A has an opening on the accommodation space 131 side. Thereby, it is possible for the rack gear 121A of the part inserted through the 1st through-hole 132A of the rack 121 to mesh|engage with the pinion gear 123 mutually. The 2nd through-hole 132B is formed in the Y-axis negative side of the center block 130, and the rack 122 is slidably inserted. The second through hole 132B has an opening on the accommodation space 131 side. Thereby, it is possible for the rack gear 122A of the part inserted into the 2nd through-hole 132B of the rack 122 to mesh|engage with the pinion gear 123 mutually.

The positioning plate 140 is an example of a "positioning member". The positioning plate 140 is a flat plate-shaped member disposed to face the upper surface of the center block 130 and extending in the Y-axis direction. The positioning plate 140 is orthogonal to each of the two racks 121 and 122, and extends to the outside of each of the two racks 121 and 122. The center of the positioning plate 140 overlaps with the center of the positioning device 100 . The center of the positioning plate 140 is always in a state overlapping with the center of the positioning device 100 irrespective of the fluctuation of the separation distance between the pair of clamping members 111 and 112 .

A holding hole 141 is formed in the center of the positioning plate 140 . The holding hole 141 has the same shape as the external shape of the protrusion 301A of the sensor case 301 included in the sensor unit 300 . In the positioning plate 140 , the protrusion 301A of the sensor case 301 is fitted into the holding hole 141 so that the center of the positioning plate 140 and the center of the sensor case 301 are aligned. To match, it is possible to keep the sensor unit 300 . That is, the positioning plate 140 holds the sensor unit 300 so that the magnetic sensor 302 formed in the center of the sensor unit 300 is positioned at the center of the surface 210A of the cover glass 210 . location can be determined.

Moreover, the positioning plate 140 has the groove part 143 which was notched from the outer peripheral edge part of the said positioning plate 140 to the holding hole 141. As shown in FIG. The groove part 143 attaches the sensor unit 300 to the surface 210A of the cover glass 210 and then removes the positioning plate 140 from the sensor unit 300. It is formed in order to draw out the cable 303 from the holding hole 141 to the outside of the positioning plate 140. As shown in FIG.

The two pins 151 and 152 engage with both the center block 130 and the positioning plate 140 to position the positioning plate 140 at an intermediate position between the pair of clamping members 111 and 112 . placed in As already explained, the center of the center block 130 is always the center of the positioning device 100 (that is, the cover glass 210 ) that does not depend on the fluctuation of the separation distance between the pair of clamping members 111 and 112 . ) and the center of the surface 210A). The positioning device 100 of the present embodiment positions the positioning plate 140 with respect to the center block 130 by the two pins 151 and 152 . Thereby, similarly to the center block 130 , the positioning device 100 of the present embodiment sets the center of the positioning plate 140 to the center of the positioning device 100 (that is, of the cover glass 210 ). center of the surface 210A).

In this embodiment, as an example, two round-bar-shaped pins 151 and 152 are used. The pin 151 is formed on the positive side of the Y-axis. The lower end of the pin 151 is fixed in a state of being inserted into the support hole 133A formed in the end of the center block 130 on the Y-axis positive side. The upper end of the pin 151 is inserted through a support hole 142A formed in the end of the positioning plate 140 on the positive Y-axis. Thereby, the pin 151 positions the Y-axis positive side of the positioning plate 140 .

The fin 152 is formed on the Y-axis negative side. The lower end of the pin 152 is fixed while being inserted into the support hole 133B formed at the end of the center block 130 on the Y-axis negative side. The upper end of the pin 152 is inserted through the support hole 142B formed in the end of the positioning plate 140 on the Y-axis negative side. Thereby, the pin 152 positions the Y-axis negative side of the positioning plate 140 .

(Mounting method of sensor unit 300)

Next, the attachment method of the sensor unit 300 using the positioning device 100 is demonstrated.

(1) First, the operator widens the distance between the pair of clamping members 111 and 112 by pulling the pair of clamping members 111 and 112 in a direction spaced apart from each other, and the center block 130 of A space in which the cover glass 210 and the outer frame 212 are mounted is formed in the upper surface. At this time, the center of the center block 130 maintains the state coincident with the center of the positioning device 100 .

(2) Next, an operator mounts the cover glass 210 and the outer frame 212 on the upper surface of the center block 130. As shown in FIG. In the positioning apparatus 100 which concerns on 2nd Embodiment, since the cover glass 210 and the outer frame 212 can be mounted on the center block 130, since it is a pair of subsequent clamping members 111, 112, It can be performed relatively easily.

(3) Next, by inserting the pair of clamping members 111 and 112 in a direction approaching each other, the operator narrows the gap between the pair of clamping members 111 and 112, and the support surface 111A; 112A) is brought into contact with the outer peripheral surface of the outer frame 212 . Thereby, along the outer diameter of the outer frame 212, the outer frame 212 is clamped by a pair of clamping members 111, 112, the center of the positioning device 100, and the surface of the cover glass 210. The centers of (210A) coincide.

(4) Next, the operator inserts the support holes 142A, 142B of the positioning plate 140 into the upper ends of the pins 151 and 152 . Thereby, the center of the positioning apparatus 100, the center of the surface 210A of the cover glass 210, and the center of the positioning plate 140 coincide.

(5) Next, the operator peels off the release paper of the double-sided tape affixed to the bottom surface of the sensor case 301, and inserts the projection 301A of the sensor case 301 into the holding hole of the positioning plate 140 ( 141) into the Thereby, the center of the sensor case 301 coincides with the center of the surface 210A of the cover glass 210 .

(6) Next, the operator presses the sensor case 301 against the surface 210A of the cover glass 210 . Thereby, the sensor case 301 is fixed to the surface 210A of the cover glass 210 in the state that the center of the sensor case 301 and the center of the surface 210A of the cover glass 210 coincide.

(7) Next, the operator pulls out the positioning plate 140 upward, and inserts the cable 303 from the holding hole 141 of the positioning plate 140 through the groove 143 to the positioning plate ( The positioning plate 140 is removed by drawing out of 140 .

(8) Next, the operator removes the cover glass 210 and the outer frame 212 from the positioning device 100 and attaches them to the case 201 of the analog meter 200 .

(9) Next, an operator fixes the cover glass 210 and the outer frame 212 to each other by fixing means, such as a transparent tape, so that the cover glass 210 does not rotate.

According to the above procedure, the operator operates the surface 210A of the cover glass 210 in a state where the center of the surface 210A of the cover glass 210 of the analog meter 200 coincides with the center of the sensor case 301 . ), the sensor unit 300 can be mounted. Therefore, according to the positioning device 100 according to the second embodiment, the magnetic sensor 302 can be easily positioned at the center of the analog meter 200 for a plurality of types of analog meters 200 having different outer diameters. have.

(Example of installation of the sensor unit 300)

18 is a plan view showing an example of installation of the sensor unit 300 according to the second embodiment to the analog meter 200 . 19 is a side view showing an example of installation of the sensor unit 300 according to the second embodiment to the analog meter 200 . In addition, in FIG. 19, about the sensor unit 300, the cross section is shown.

The analog meter 200 shown in FIG. 18 is, for example, a water meter, a power meter, a gas meter, or the like. As shown in FIG. 18 , the analog meter 200 includes a case 201 , a display surface 202 , a pointer 203 , a magnet 204 , a cover glass 210 , and an outer frame 212 . ) is provided. The case 201 is a cylindrical member constituting the external shape of the analog meter 200 with a closed bottom surface. The display surface 202 is a horizontal surface formed inside the case 201 and facing the space above the analog meter 200 . The display surface 202 has a circular shape in planar view. On the display surface 202, scales indicating various measurement values in stages are continuously printed along the circumferential direction. The pointer 203 has a rotation shaft 203A and rotates about the rotation shaft 203A as a rotation center to indicate a scale printed on the display surface 202 according to various measurement values. The magnet 204 has a disk shape and is attached to the rotation center of the pointer 203 . The magnet 204 is magnetized to an N pole and an S pole with the boundary line passing through the center of the magnet 204 as a boundary in planar view. The cover glass 210 is an example of "a substantially circular and transparent cover member", and is a transparent and disk-shaped glass member that covers the display surface 202 . The "substantially circular and transparent cover member" is not limited to glass, and may be made of resin. The outer frame 212 is a member in the form of a circular frame, and is fitted to the opening edge of the upper side (the one on the right side of the Z axis) of the case 201 . The outer frame 212 holds the outer peripheral edge of the cover glass 210 disposed therein.

18 and 19 , the sensor unit 300 is located at the center of the surface 210A of the cover glass 210 provided in the analog meter 200 by using the positioning device 100 (that is, center of rotation of the pointer 203). In the sensor unit 300 , a magnet 204 is formed in the center of the sensor case 301 toward the analog meter 200 side (Z-axis side side). Magnetic sensor 302 is a magnet ( 204) is opposite. In this way, the magnetic sensor 302 can magnetically detect the rotation angle of the pointer 203 . Then, the sensor unit 300 transmits a rotation angle detection signal indicating the rotation angle detected by the magnetic sensor 302 to the rotation angle transmitter 230 via the cable 303 and the wireless communication unit 220 . do. For example, the sensor unit 300 continuously detects the rotation angle of the pointer 203 at predetermined time intervals (eg, n second intervals), and transmits the rotation angle detection signal at predetermined time intervals (eg, n second intervals). For example, n second intervals) to the rotation angle transmitter 230 continuously.

The rotation angle transmitter 230 receives the rotation angle detection signal transmitted from the sensor unit 300, and uses the rotation angle of the pointer 203 indicated by the rotation angle detection signal to perform predetermined processing (for example, monitor display, abnormality detection, recording, data transmission to other devices, etc.). For example, the rotation angle transmitter 230 transmits a rotation angle detection signal indicating the detected rotation angle via wireless communication (eg, Bluetooth (registered trademark) wireless communication, Sigfox (registered trademark) wireless communication) , to the gateway or cloud.

(Example of extension of positioning device 100)

20 : is a figure which shows the extension example of the positioning apparatus 100 which concerns on 2nd Embodiment. In the extended example shown in FIG. 20, the positioning apparatus 100 is further equipped with a pair of V-shaped adapters 161, 162. As shown in FIG. The pair of V-shaped adapters 161 and 162 are attached to the support surfaces 111A and 112A of the pair of clamping members 111 and 112, so that they are attached to the respective V-shaped support surfaces 161A, 162A. Thereby, the minimum diameter of the outer frame which can be clamped by a pair of clamping member 111, 112 can be made small.

In addition, in this document, the "substantially circular" of "a substantially circular and transparent cover member" is not limited to a perfect circle, and includes the case where a part of the circle has protrusions, irregularities, notches, and the like. In other words, the "cover member" should just have a shape in which the "sensor unit" can be positioned at the center by the "positioning device".

As mentioned above, although one Embodiment of this invention was described in detail, this invention is not limited to these embodiment, Various deformation|transformation or change is possible within the scope of the summary of this invention as described in a claim. do.

This international application claims priority based on Japanese Patent Application No. 2020-066968, filed on April 2, 2020, and Japanese Patent Application No. 2020-102578, filed on June 12, 2020 , the entire contents of the application are incorporated herein by reference.

10: structure
20: magnet
30: Instructions
30A: center of rotation
32: rotation shaft part
34: circumference
100: magnetic fixture
100A: body part
102: slit part
102A: opening
102B: top
102C: If
110: upper wall part
111: upper slide groove
112: magnet holding part
112A: inner peripheral edge
120: lower wall part
121: guide part
122: rotation shaft holding part
123A: first elastic beam part
123B: second elastic beam part
124: rotation shaft control unit
130: Directive Regulatory Department
130A: Gap
131: protrusion
131A: first abutting surface
132: tongue part
32A: second abutting surface
200: rotation angle detection system
210: analog meter
211: glass cover
220: rotation angle detection device
230: rotation angle transmitter
AX1: center
AX2 : center of rotation
100: positioning device
111, 112: no pinching
111A, 112A: support surface
111B, 112B: first through hole
111C, 112C: second through hole
113: screw
121, 122: rack
121A, 122A : Rack Gear
123: pinion gear
130: center block
131: receiving space
132A: first through hole
132B: second through hole
133A, 133B: support hole
140: positioning plate
141: maintenance worker
142A, 142B: support hole
143: home
151, 152: pin
161, 162 : V-shaped adapter
161A, 162A: support surface
200: analog meter
201 : Case
202: display surface
203: Instructions
203A: axis of rotation
204: magnet
210: cover glass
210A: surface
212: outer frame
212A: outer circumference
220: wireless communication device
230: rotation angle transmitter
300: sensor unit
301: sensor case
302: magnetic sensor
303: cable

Claims (8)

A magnet fixture mounted at the center of rotation of the pointer of an analog meter to fix a magnet for detecting a rotation angle,
body and
a magnet holding part formed on the upper surface of the body part to hold the magnet on the center of rotation of the pointer;
a slit portion formed on a plane orthogonal to the rotation center in the main body portion to accommodate the rotation center of the pointer;
a rotation shaft holding part formed below the slit part in the main body part to hold the rotation shaft part of the pointer;
and a pointer regulating part protruding outward from the outer periphery of the body part and regulating rotation of the pointer with respect to the body part. The method of claim 1,
The body part,
A first elastic beam portion and a second elastic beam portion disposed opposite to each other under the slit portion,
The rotating shaft holding unit,
A magnet fixture formed between the first elastic beam portion and the second elastic beam portion, wherein the rotation shaft portion is held by holding the rotation shaft portion by the first elastic beam portion and the second elastic beam portion. 3. The method of claim 2,
The body part,
Between the first elastic beam part and the second elastic beam part, a guide part extending from the outer peripheral edge of the body part toward the rotation shaft holding part gradually narrows in width, and having a guide part for guiding the rotation shaft part to the rotation shaft holding part. magnetic fixture. 4. The method according to any one of claims 1 to 3,
The guideline regulation department,
a protrusion formed to protrude from the outer peripheral edge of the main body in the longitudinal direction of the pointer;
Magnet fixture, characterized in that it is formed extending from the protrusion in the width direction of the guide, elastically deformable in a direction parallel to the center of rotation, and having a tongue section for pressing the guide. 5. The method of claim 4,
The tongue part,
It is formed to be inclined from the protrusion so that the gap between the protrusion and the protrusion gradually widens in a direction parallel to the center of rotation,
The guideline regulation department,
Holding both ends in the width direction of the pointer disposed in the gap by the first abutting surface of the protrusion exposed in the gap and the second abutting surface of the tongue piece exposed in the gap Features a magnetic fixture. 6. The method according to any one of claims 1 to 5,
The slit portion,
A magnet having an opening in an outer periphery of the main body, sliding a rotational center of the pointer from the opening in a direction perpendicular to the rotational center, and accommodating the rotational center of the pointer in the slit portion fixture. 7. The method according to any one of claims 1 to 6,
A magnet fixture, characterized in that it is integrally formed by using a resin material having elasticity. 8. The method of claim 7,
A magnet fixture characterized in that the resin material is formed by injection molding.

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